Variations in physiological, biochemical, and structural traits of photosynthesis and resource use efficiency in maize and teosintes (NADP-ME-type C4)

Takayuki Yabiku, Ueno Osamu

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Abstract

C4 plants show higher photosynthetic capacity and resource use efficiency than C3 plants. However, the genetic variations of these traits and their regulatory factors in C4 plants still remain to be resolved. We investigated physiological, biochemical, and structural traits involved in photosynthesis and photosynthetic water and nitrogen use efficiencies (PWUE and PNUE) in 22 maize lines and four teosinte lines from various regions of the world. Net photosynthetic rate (PN) ranged from 32.1 to 46.5 μmol m−2 s−1. PN was positively correlated with stomatal conductance, transpiration rate, and chlorophyll, nitrogen and soluble protein contents of leaves, but not with specific leaf weight. PN was positively correlated with the activities of ribulose-1,5-bisphosphate carboxylase/oxygenase and the C4-acid decarboxylases, NADP-malic enzyme and phosphoenolpyruvate carboxykinase, but not with the activity of phosphoenolpyruvate carboxylase. Leaf structural traits (stomatal parameters, leaf thickness, and interveinal distance) were not correlated with PN. These data suggest that physiological and biochemical traits are involved in the genetic variation of PN, but structural traits are not directly involved. PWUE is in the lower class of values reported for C4 plants, whereas PNUE is in the highest class of values reported for C4 plants. PNUE was negatively correlated with leaf nitrogen content but not significantly correlated with PN. PWUE was not correlated with δ13C values of leaves, indicating difficulty in using δ13C values as an indicator of PWUE of maize. In general, teosinte lines showed lower PN but higher PWUE than maize lines.

Original languageEnglish
Pages (from-to)448-458
Number of pages11
JournalPlant Production Science
Volume20
Issue number4
DOIs
Publication statusPublished - Oct 2 2017

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Zea
C4 plants
photosynthesis
corn
leaves
phosphoenolpyruvate carboxykinase (pyrophosphate)
genetic variation
malic enzyme
phosphoenolpyruvate carboxylase
C3 plants
ribulose 1,5-diphosphate
nutrient use efficiency
oxygenases
nitrogen content
water use efficiency
stomatal conductance
transpiration
protein content
chlorophyll
acids

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science

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Variations in physiological, biochemical, and structural traits of photosynthesis and resource use efficiency in maize and teosintes (NADP-ME-type C4). / Yabiku, Takayuki; Osamu, Ueno.

In: Plant Production Science, Vol. 20, No. 4, 02.10.2017, p. 448-458.

Research output: Contribution to journalArticle

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